The Earth is slowing down
Now how is that for a headline?
As regular readers will know, we try to bring you the news that other media outlets don't.
We know that some readers are keen to know that the National
Physical Laboratory has found it necessary to add yet another
tenth of a second to UTC (GMT) which is the time measured by atomic
clocks and which governs modern life.
Because the revolution of the earth is slowing down, corrections
have to be made to GMT at unpredictable intervals. For quite a few
months this correction was -100mS. It is now -200mS which means our
clocks are two tenths of a second faster than astronomical time. The
relevant bits are bordered in red on our illustration, which shows the
output of the NPL atomic clock in Anthorn.
As soon as the correction factor reaches a full second, a
leap second will have to be added to GMT. The last time this happened
was on the 30th of June 2012. You can watch this historical event by following this link.